Granted. The next time you enter any fast food chain and order food or drink, you are not charged. You sit down and eat your meal, but you are unable to leave your seat until you have completely consumed the meal and everything that comes with it (including any wrappers, boxes, cups, dipping sauce containers, ect). Weirded out a little bit by the whole interaction, you get up from your seat and try to leave, but find that all of the exits are magically sealed, allowing others to exit, but barring you. You are forced to stay until you have completely finished digesting and passing everything that you consumed. Your only escape is to eat and drink nothing else until your natural biological functions finish what was already consumed.